docs: document get_download_url() and fix API-key/host placeholders

[wei-hai]

What

Documents the previously-undocumented get_download_url() and fixes two inaccurate placeholders in the docs.

Changes

• New "Downloading outputs" section — covers to_file / to_bytes, range reads, and get_download_url(). The README previously only showed to_file.
• API-key placeholder ck_... → comfyui-... (3 spots) — verified the real key prefix live against staging and prod.
• __init__.py docstring host cloud.comfy.org → api.comfy.org — the old host 404s; api.comfy.org is the Comfy Cloud v2 endpoint.

Verified

get_download_url() was exercised end-to-end against staging and prod: returns a self-authorizing GCS signed URL with an expires_at, fetchable with no API key (HTTP 200). Hygiene scanner + package import pass. Docs-only; no code behavior change.

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Reviewing files that changed from the base of the PR and between 38cac1c and 58a539e.

📒 Files selected for processing (2)

• README.md
• src/comfy_sdk/__init__.py

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